[pbs-devel] [PATCH v2 proxmox-backup] fix #2996: client: allow optional match patterns for restore

[Christian Ebner <c.ebner@proxmox.com>]

When the user is only interested in a subset of the entries stored in
a file-level backup, it is convenient to be able to provide a list of
match patterns for the entries intended to be restored.

The required restore logic is already in place. Therefore, expose it
for the `proxmox-backup-client restore` command by adding the optional
array of patterns as command line argument and parse these before
passing them via the pxar restore options to the archive extractor.

Link to bugtracker issue:
https://bugzilla.proxmox.com/show_bug.cgi?id=2996

Signed-off-by: Christian Ebner <c.ebner@proxmox.com>
Tested-by: Gabriel Goller <g.goller@proxmox.com>
---
Changes since version 1:
 - bail when `matches` are used in combination with restore to stdout
 - fix typo in commit title

 proxmox-backup-client/src/main.rs | 31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/proxmox-backup-client/src/main.rs b/proxmox-backup-client/src/main.rs
index 32fe914c4..08582c86d 100644
--- a/proxmox-backup-client/src/main.rs
+++ b/proxmox-backup-client/src/main.rs
@@ -1186,6 +1186,15 @@ We do not extract '.pxar' archives when writing to standard output.
 
 "###
             },
+            "matches": {
+                type: Array,
+                description: "Only restore entries matching given paths or patterns.",
+                optional: true,
+                items: {
+                    type: String,
+                    description: "Path or match pattern.",
+                },
+            },
             rate: {
                 schema: TRAFFIC_CONTROL_RATE_SCHEMA,
                 optional: true,
@@ -1306,6 +1315,24 @@ async fn restore(
     let target = json::required_string_param(&param, "target")?;
     let target = if target == "-" { None } else { Some(target) };
 
+    let mut match_list = Vec::new();
+    if let Some(patterns) = param["matches"].as_array() {
+        if target.is_none() {
+            bail!("matches not allowed when restoring to stdout");
+        }
+
+        for pattern in patterns {
+            if let Some(pattern) = pattern.as_str() {
+                let match_entry = MatchEntry::parse_pattern(
+                    pattern,
+                    PatternFlag::PATH_NAME,
+                    MatchType::Include
+                )?;
+                match_list.push(match_entry);
+            }
+        }
+    };
+
     let crypto = crypto_parameters(&param)?;
 
     let crypt_config = match crypto.enc_key {
@@ -1429,8 +1456,8 @@ async fn restore(
         }
 
         let options = pbs_client::pxar::PxarExtractOptions {
-            match_list: &[],
-            extract_match_default: true,
+            match_list: match_list.as_slice(),
+            extract_match_default: match_list.is_empty(),
             allow_existing_dirs,
             overwrite_flags,
             on_error,
-- 
2.39.2



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